1SAVE MONEY & 100% SAFE: Stop spending money on Pest Control Companies that flood your house with hazardous chemicals. The frequency is 19KHz~100KHz, no harm on humans, dogs, cats or other pet and plants. But extremely annoying to mice, rats,insects, roac 2EFFICIENTLY ULTRASONIC TECHNOLOGY: This ultrasonic pest repellent emits 3 kinds of frequency ultrasonic,mechanical and electromagnetic wave, can be changed automatically avoid pests being adaptive or immune, the wave will stimulate nervous system and Aud 3LCD DISPALY & TOUCH SWITCH: The LCD display of the ultrasonic mouse control can shows different modes in Function mode(first 1-2 weeks) and Automatic mode( following weeks) Press the Touch Switch to choose. Easy to opreate, just plug in, choose the mode, 4WIDE COVERAGE AREA: This Pest Repeller can affect around 100 square meters, However ultrasonic waves cannot travel through walls and solid objects. We commend get one unit for each room, additional units will be required in larger areas. Affect in office 5GUARANTEE - Usually, you'll see results within 1-2 weeks, depending on the amount of infestation. YOUTHINK Standby to reply questions and emails within 24 hours, 30-day no-question-asked money back guarantee, 24 months replacement warranty (Non-human-dam